The Evolving Quality Landscape for New Build Homes
The quality of new build homes in the United Kingdom is undergoing its most significant transformation in decades. Following years of criticism from homeowners, consumer groups and government inquiries, a wave of regulatory changes is reshaping how homes are designed, built and inspected. From the establishment of the New Homes Quality Board to the implementation of the Future Homes Standard, 2025 and 2026 represent a pivotal period for anyone buying or building a new property.
For prospective buyers, understanding these changes is not merely academic — it directly affects the energy efficiency, safety, durability and overall quality of the home you’re purchasing. Developers who meet or exceed the new standards will deliver materially better homes than those built under previous regulations. Knowing what to expect helps you ask the right questions, compare developments more effectively and spot any shortcomings during your snagging inspection.
This guide explains every major regulatory and quality framework change that affects new homes being designed and built in 2025 and 2026, including what it means for you as a buyer.
Building Regulations 2025/2026: Key Changes
The Building Regulations for England and Wales have seen substantial updates across multiple Approved Documents. These regulations set the minimum legal standards for construction, and any home built or substantially modified must comply with the versions in force at the time the building control application is made.
The most impactful change is the uplift to Approved Document Part L (Conservation of Fuel and Power), which from 2025 requires new homes to produce approximately 75–80% less CO2 emissions than those built under the 2013 regulations. This is delivered through a combination of improved insulation (lower U-values for walls, roofs and floors), higher-performance windows and doors, better airtightness standards and, in most cases, the installation of low-carbon heating systems such as air source heat pumps rather than gas boilers.
Approved Document Part F (Ventilation) has been updated to work in tandem with improved airtightness. Homes that are sealed more tightly need more sophisticated ventilation to maintain indoor air quality. Mechanical ventilation with heat recovery (MVHR) systems are becoming standard in many new developments, and where they are installed, the quality of the ductwork installation is a key snagging consideration.
Approved Document Part O (Overheating) is a relatively new requirement, introduced to prevent homes from becoming dangerously hot during summer months. It mandates that designers consider solar gain, cross-ventilation and shading from the outset. For buyers, this means you should expect to see evidence that an overheating risk assessment has been carried out, particularly for south- and west-facing properties, top-floor flats and those with large glazed areas.
Approved Document Part S (Infrastructure for the Charging of Electric Vehicles) now requires every new home with associated parking to have an electric vehicle charge point installed. This should be a minimum 7kW smart charger. During your snagging check, verify that the charger is operational, properly wired and accessible.
The New Homes Quality Board and NHQB Code
The New Homes Quality Board (NHQB) was established in 2021 and launched its New Homes Quality Code in 2022, with all major housebuilders required to register by 2025. The NHQB represents the most significant change to consumer protection for new build buyers in a generation, providing an independent body to oversee standards and resolve disputes.
The NHQB Code sets out requirements across the entire customer journey, from pre-purchase information and sales practices through to after-sales service, complaints handling and dispute resolution. Crucially, it requires developers to have a robust snagging process with clear timescales for acknowledging reports and completing repairs.
Under the NHQB Code, developers must allow buyers a reasonable pre-completion inspection and must respond to snagging reports within clear timeframes. The Code also establishes a New Homes Ombudsman Service (NHOS) to adjudicate disputes that cannot be resolved directly between the buyer and developer. If the Ombudsman finds in your favour, the developer can be ordered to carry out repairs, pay compensation of up to £25,000, or issue a formal apology.
Before purchasing, check whether your chosen developer is registered with the NHQB. All major volume housebuilders, including Barratt, Persimmon, Taylor Wimpey, Bellway and Redrow, are registered members. Smaller developers may not yet be registered, although registration is expanding. You can verify membership on the NHQB website.
The Future Homes Standard: Transforming Energy Performance
The Future Homes Standard (FHS) represents the government’s flagship policy to ensure that all new homes built from 2025 are “zero carbon ready” — meaning they will not need to be retrofitted to meet net-zero targets in the future. This standard goes significantly beyond the interim Part L uplift and sets a trajectory towards truly low-carbon housing.
The headline requirement is a 75–80% reduction in CO2 emissions compared to the 2013 Part L baseline. In practice, this means most new homes will be heated by electric heat pumps (air source or ground source) rather than gas boilers. The FHS effectively ends the installation of gas heating in new properties, although some transitional provisions exist for developments with planning permission already granted.
For snagging and quality purposes, the FHS introduces several areas to check that didn’t exist a few years ago. Heat pump installations must be correctly sized and commissioned, with flow temperatures typically around 35–45°C rather than the 60–80°C of a gas system. This means radiators need to be larger, and underfloor heating is often preferred. Incorrect sizing is a common defect that can lead to rooms not reaching comfortable temperatures.
Airtightness testing is mandatory, and results should be available for inspection. The target is typically 5 m³/h/m² at 50 Pa or better. Poor airtightness — often caused by gaps around service penetrations, windows, or at junctions between walls and floors — is both an energy efficiency issue and a potential source of draughts and condensation. Ensure you ask to see the airtightness test certificate as part of your handover documentation.
Energy Performance and EPC Ratings
Under the combined effect of Part L and the Future Homes Standard, new build homes in 2026 should comfortably achieve an Energy Performance Certificate (EPC) rating of A or high B. An EPC A rating indicates that the home’s estimated energy costs are among the lowest achievable, and its environmental impact score will be correspondingly high.
Buyers should request the predicted EPC before purchase and verify the as-built EPC at handover. Any significant discrepancy between the two should be investigated. Common causes include substitution of materials during construction (e.g. less efficient windows than specified), installation defects that reduce insulation performance, or commissioning issues with the heating system.
The energy performance of your new home also has financial implications beyond running costs. Homes with higher EPC ratings may qualify for better mortgage rates from lenders offering “green mortgage” products, with some lenders offering up to 0.2% lower interest rates for EPC A-rated properties. The resale value premium for energy-efficient homes is also growing, with research from the Department for Energy Security and Net Zero indicating a 5–14% price premium for A-rated homes compared to equivalent D-rated properties.
Approved Document Updates in Detail: Parts L, F, O and S
Let’s examine each of the key Approved Document changes and what they mean in practical terms for the home you’ll be living in.
Part L in its 2025 form is the most technically demanding set of fabric requirements ever applied to new housing in England. The U-values for walls (0.15–0.18 W/m²K) typically require full-fill cavity insulation or external wall insulation with minimal thermal bridging. Thermal bridging details at junctions (wall-to-floor, wall-to-roof, around windows) are critical — poorly detailed junctions can account for up to 30% of a home’s heat loss. During snagging, look for evidence of insulation continuity, properly sealed service penetrations, and correctly installed cavity trays and barriers.
Part F ventilation requirements mean you should find trickle vents on every opening window, correctly ducted extract fans in kitchens and bathrooms (venting to outside, not into the loft space), and potentially a whole-house MVHR system. Common snagging issues include blocked trickle vents from paint overspray, extract fans not connected to external ducts, MVHR ductwork with excessive bends reducing airflow, and missing commissioning certificates. For a complete overview of what to check, see our common defects guide.
Part O addresses a problem that has become increasingly common in well-insulated, highly-glazed modern homes: overheating in summer. Developers must demonstrate through calculation (using CIBSE TM59 for flats or the simplified method for houses) that bedrooms will not exceed 26°C for more than 3% of annual occupied hours and that living areas will not exceed 28°C for more than 3% of occupied hours. External shading, openable window areas and cross-ventilation strategies are all part of the compliance approach.
Part S is straightforward but often overlooked during snagging. Verify that the EV charger is installed, powered, functional and smart-enabled (capable of responding to signals from the energy grid). The charger should be positioned accessibly, and the installation should have been certified by a qualified electrician. Ask for the installation certificate and user manual at handover.
What This All Means for Buyers in 2026
The combined effect of these regulatory changes is that a new build home purchased in 2026 should be demonstrably superior to one built just three or four years earlier. It should be warmer in winter, cooler in summer, cheaper to run, better ventilated, equipped for electric vehicle ownership and backed by a more robust consumer protection framework.
However, higher standards also mean more complexity in construction, and more potential for things to go wrong. A heat pump installed but not properly commissioned will not heat your home effectively. MVHR ductwork with poor connections will be noisy and inefficient. Triple-glazed windows installed with gaps in the insulation around the frames will create cold spots and condensation. The irony of better standards is that they require more skilled installation — and snagging becomes even more important.
When you book your snagging inspection, ensure your inspector is up to date with the current Building Regulations and can assess heat pump installations, MVHR systems and airtightness details alongside traditional items like paintwork and tiling. A 2026-standard home deserves a 2026-standard inspection.
Keep all handover documentation — EPC, airtightness test certificate, commissioning certificates for heat pumps and ventilation, and your NHBC or equivalent warranty details. These documents are your evidence that the home was built to the standards promised. If something doesn’t match up, refer to our handover guide for your next steps.